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Method for halogenation of butyl rubber without using acid neutralizing agent

A technology for halogenating butyl rubber and butyl rubber, applied in the field of halogenation of butyl rubber, can solve the problems of no enlightenment and the like

Inactive Publication Date: 2008-01-09
LANXESS CORP (CA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, there is no revelation to dispense with the need for aqueous acid neutralization as far as Kowalski et al. are concerned, since aqueous acid neutralization is not desirable in the first place

Method used

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  • Method for halogenation of butyl rubber without using acid neutralizing agent
  • Method for halogenation of butyl rubber without using acid neutralizing agent
  • Method for halogenation of butyl rubber without using acid neutralizing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Example 1: Bromination of RB301 (with water and caustic). To a solution of RB301 (50 g, 1.6 mol% 1,4-isoprene) in 600 mL hexane was added 45 mL of water. To this mixture was added 0.63 mL of elemental bromine with rapid stirring. After 5 minutes, the reaction mixture was neutralized by introducing a caustic solution prepared by mixing 6.5 mL of aqueous 1.0 M NaOH in 500 mL of water. Immediately following neutralization, 4 ml of stabilizer solution (3.75 g of epoxidized soybean oil and 0.045 g of Irganox 1076 in 100 ml of hexane) were fed to the reaction mixture. The rubber was isolated by steam condensation and dried to constant weight with the aid of a 6" x 12" two-roll mill operating at 100°C. use 1 H nuclear magnetic resonance spectrometer (CDCl 3 ) to measure the microstructure of the obtained material, and the results are listed in Table 1.

Embodiment 2

[0048] Example 2: Bromination of RB301 (without water and caustic). To a solution of RB301 (50 g, 1.6 mol% 1,4-isoprene) in 600 mL of hexane was added 0.63 mL of elemental bromine under rapid stirring. After 5 minutes, 4 ml of stabilizer solution (3.75 g of epoxidized soybean oil and 0.045 g of Irganox 1076 in 100 ml of hexane) were fed to the reaction mixture. The rubber was isolated by steam condensation and dried to constant weight with the aid of a 6" x 12" two-roll mill operating at 100°C. use 1 H nuclear magnetic resonance spectrometer (CDCl 3 ) to measure the microstructure of the obtained material, and the results are listed in Table 1.

Embodiment 3

[0049] Example 3: Bromination of RB402 (without water and caustic). To a solution of RB402 (50 g, 2.0 mol% 1,4-isoprene) in 600 mL of hexane was added 0.63 mL of elemental bromine under rapid stirring. After 5 minutes, 4 ml of stabilizer solution (3.75 g of epoxidized soybean oil and 0.045 g of Irganox 1076 in 100 ml of hexane) were fed to the reaction mixture. The rubber was isolated by steam condensation and dried to constant weight with the aid of a 6" x 12" two-roll mill operating at 100°C. use 1 H nuclear magnetic resonance spectrometer (CDCl 3 ) to measure the microstructure of the obtained material, and the results are listed in Table 1.

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Abstract

A method to halogenate butyl rubber in the absence of water and, more particularly, without the need for addition of neutralization agents. The butyl rubber contains at least 4.1 mol% of a multi-olefin and the multi-olefin serves as a sink for the hydrohalic Brnsted acids generated when a halogenation agent is added. This obviates the need for aqueous phase acid neutralization. The novel halogenated butyl rubber produced using the method advantageously possesses a high degree of desirable exo-allylic bromides with relatively low levels of the less desirable endo-allylic bromides.

Description

technical field [0001] The present invention relates to the halogenation of butyl rubber in the absence of a neutralizing agent. More specifically, the present invention relates to a process for the halogenation of butyl rubber in the absence of water and the addition of a neutralizing agent, the polymers produced according to the process, and cured articles made therefrom. Background technique [0002] Random copolymers of isobutylene (IB) and isoprene (IP) are synthetic elastomers commonly known as butyl rubber (IIR). Since the 1940s, IIRs have been prepared by the slurry process, in which isobutene is randomly copolymerized with small amounts of isoprene (1-2 mol%). The IIR backbone structure (Fig. 1), mainly composed of polyisobutylene segments, endows the material with high gas impermeability, stability to oxidation and excellent fatigue resistance (see Chu, C.Y. and Vukov, R., Macromolecules, 18, 1423-1430, 1985). [0003] The first major use of IIR is in tire inner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/12C08F8/20
Inventor R·雷森迪斯G·卡斯扎斯
Owner LANXESS CORP (CA)
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